If you're having trouble choosing an instrument or application, a good place to browse is the Annual Review of Analytical Chemistry. Feel free to browse the latest volume by clicking the link above and scrolling down the page. You can also navigate to the Annual Review Homepage, and from there use the left sidebar to filter by journal and year. NOTE that these articles are all review articles, so they cannot be selected as your primary article. However, you can view their references list to find a primary source that interests you, and use the review as another source.
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One very useful feature of Google Scholar is its ability to allow for easily finding articles which have cited an article that you have found. When looking at search results, check for the 'Cited by X' link underneath each result. That will tell you how many subsequent articles (that Google Scholar is aware of...it's not 100% comprehensive! This is a ballpark figure) have cited this particular article.
Try it using the example article from your assignment:
Cochran, K.H.; Barry, J.A.; Muddiman,D.C.; Hinks, D. Direct Analysis of Textile Fabrics and Dyes Using Infrared Matrix-Assisted Laser Desorption Electrospray Ionization Mass Spectrometry. Anal. Chem. 2013, 85, 831−836